SDET (Flutter)

X-FLOW is a mobile game development company established in 2018. We gained recognition after the release of Happy Color, the most popular digital coloring book and one of the most successful ad-driven mobile apps in the world.

We are looking for a proactive Senior SDET with deep expertise in Flutter app testing for our flagship project, Happy Color.

Key Responsibilities:

• Design, scale, and maintain a comprehensive test automation strategy for our Flutter application across all levels: unit, widget, integration, golden/visual regression, and API/contract testing.
• Build and support test automation infrastructure in Dart and Flutter using flutter_test, integration_test, and other relevant tools.
• Architect the test automation project from scratch, establishing engineering standards, design patterns, and best practices.
• Drive effective test coverage, prioritizing critical user journeys, core business logic, application stability, and API reliability.
• Implement code coverage tracking for unit and widget tests, define minimum coverage thresholds, and set up automated quality gates for Merge Requests (MRs).
• Enforce strict quality criteria, ensuring MRs are automatically blocked if coverage drops, required tests fail, or quality standards are violated.
• Integrate test execution into CI/CD pipelines, including unit/widget/golden tests on MRs and integration/E2E test runs on emulators, simulators, and real devices.
• Contribute to mobile app observability: define quality metrics, monitor crash rate, ANR, app launch time, screen performance, and scenario stability; validate logging, analytics events, and error handling; help integrate performance monitoring and crash reporting tools.
• Conduct thorough code reviews for test suites (unit, widget, integration, golden, and E2E).
• Participate in product Flutter code reviews to ensure testability, stability, and adherence to quality engineering practices.
• Help define and evolve the Android/iOS device matrix, taking into account OS versions, screen resolutions, hardware performance, and platform-specific behavior.
  

Requirements:

• 5+ years of experience in mobile test automation.
• 2+ years of hands-on experience with Flutter and Dart.
• Strong proficiency in writing unit, widget, integration, golden, and API/contract tests.
• Deep understanding of Flutter test frameworks (flutter_test, integration_test) and test architecture patterns.
• Experience integrating test automation into CI/CD pipelines and establishing automated quality gates for MRs.
• Solid understanding of Flutter interactions with native platforms (Android and iOS).
• Familiarity with mobile app performance profiling, observability, and crash reporting tools (monitoring ANRs, launch times, crash rates).
• Russian — C1 or higher, English — B1+.
  
  

What We Offer:

• Competitive salary and benefits package.
• Opportunity to work with a talented and passionate team in a creative and dynamic environment.
• Flexible working hours and remote/office work options.
• Career growth and professional development opportunities.
• A fun and inclusive company culture that celebrates diversity and creativity.